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Use tricky method to resolve type check

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danielsss 2022-12-26 17:01:22 +11:00
parent 5724719485
commit 305915270a
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1 changed files with 10 additions and 9 deletions
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19
codes/typescript/chapter_hashing/array_hash_map.ts
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@ -18,7 +18,7 @@ class Entry {
/* 基于数组简易实现的哈希表 */ /* 基于数组简易实现的哈希表 */
class ArrayHashMap { class ArrayHashMap {
private readonly bucket: Entry | null[]; private readonly bucket: (Entry | null)[];
constructor() { constructor() {
// 初始化一个长度为 100 的桶（数组） // 初始化一个长度为 100 的桶（数组）
@ -52,8 +52,8 @@ class ArrayHashMap {
} }
/* 获取所有键值对 */ /* 获取所有键值对 */
public entries(): Entry[] { public entries(): (Entry | null)[] {
let arr = []; let arr: (Entry | null)[] = [];
for (let i = 0; i < this.bucket.length; i++) { for (let i = 0; i < this.bucket.length; i++) {
if (this.bucket[i]) { if (this.bucket[i]) {
arr.push(this.bucket[i]); arr.push(this.bucket[i]);
@ -63,22 +63,22 @@ class ArrayHashMap {
} }
/* 获取所有键 */ /* 获取所有键 */
public keys(): number[] { public keys(): (number | undefined)[] {
let arr = []; let arr: (number | undefined)[] = [];
for (let i = 0; i < this.bucket.length; i++) { for (let i = 0; i < this.bucket.length; i++) {
if (this.bucket[i]) { if (this.bucket[i]) {
arr.push(this.bucket[i].key); arr.push(this.bucket[i]?.key);
} }
} }
return arr; return arr;
} }
/* 获取所有值 */ /* 获取所有值 */
public values(): string[] { public values(): (string | undefined)[] {
let arr = []; let arr: (string | undefined)[] = [];
for (let i = 0; i < this.bucket.length; i++) { for (let i = 0; i < this.bucket.length; i++) {
if (this.bucket[i]) { if (this.bucket[i]) {
arr.push(this.bucket[i].val); arr.push(this.bucket[i]?.val);
} }
} }
return arr; return arr;
@ -121,6 +121,7 @@ map.print();
/* 遍历哈希表 */ /* 遍历哈希表 */
console.info('\n遍历键值对 Key->Value'); console.info('\n遍历键值对 Key->Value');
for (const entry of map.entries()) { for (const entry of map.entries()) {
if (!entry) continue;
console.info(entry.key + ' -> ' + entry.val); console.info(entry.key + ' -> ' + entry.val);
} }
console.info('\n单独遍历键 Key'); console.info('\n单独遍历键 Key');